Hi Sarah, thanks for all those wonderfull tips, that absolutely should work, normally.
Too bad this time is an exception on that rule, because the sim I was talking about really likes to stick to the title of this topic: 'He just doesn't want to die.' Can't remember I've put so many capitals in that title, but oh well.
Deleting the sim isn't a option to, because his avatar will simply stay in the three of sims listed when I am in live mode.
Dragging his hunger bar to zero I don't even need to try, because soaking in a swimming pool day and night doesn't help already. And with doing that, his hunger- and energy bar where already dangerously red.
Too bad all this doesn't work for me, because my family graveyard isn't going to be complete this way. Mostly I am more a player that likes the sims to die when they have fullfilled their lifetime wishes and at old age, but this one is really pushing it.